How to pass variable from uitableview to second tableview using didSelectRowAtIndexPa

i want to pass the variable from a view controller to another one, so that when the user selects a certain row in the first table view, the application will take him to another view controller in which the details of the selected item will appear.
This is my code :

Code:

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
        
    	NSString *selectedAuthors = [theauthors objectAtIndex:indexPath.row];
    	
        
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
        Details *dvController = [storyboard instantiateViewControllerWithIdentifier:@"Details"]; //Or whatever identifier you have defined in your storyboard
        
    
        
    	
           
        dvController.selectedAuthors = selectedAuthors;

        UIAlertView *messageAlert = [[UIAlertView alloc]
                                    initWithTitle:@"Row Selected" message:authorNAme delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
       
       // Display Alert Message
        authorNAme =  [[NSString stringWithFormat:[theauthors objectAtIndex:indexPath.row]] intValue];
     [messageAlert show];
        
    	[self.navigationController pushViewController:dvController animated:YES];
    }

selectedAuthors is a string
authorName is a global variable in which i want to store the content of the selected row.
Any help will be highly appreciated.